RFR: 8269753: Misplaced caret in PatternSyntaxException's detail message [v3]

[Ian Graves]

> Fixes a bug where carets aren't indented correctly in PatternSyntaxException messages because tab characters are converted to spaces in their indentation.

Ian Graves has updated the pull request incrementally with one additional commit since the last revision:

  Tweaking some spacing. Fixing some report placement.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4906/files
  - new: https://git.openjdk.java.net/jdk/pull/4906/files/339b438a..c47b0651

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4906&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4906&range=01-02

  Stats: 6 lines in 1 file changed: 2 ins; 2 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4906.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4906/head:pull/4906

PR: https://git.openjdk.java.net/jdk/pull/4906